<!DOCtype>
<html>
<head>
    <title>CSS波浪</title>
    <link href="css/app.css" rel="stylesheet" type="text/css">
</head>
<body>
    <div class="wrap">
        <div class="bgbox">
            <div class="conbox"></div>
            <div class="conbox1"></div>
        </div>
    </div>
</body>

</html>